Which of the Following Statements Concerning the Degradation of Amino

Which of the following statements concerning the degradation of amino acid carbon "skeletons" is correct?

A) Each of the 20 standard amino acids gives a different degradation product.
B) Each of the 20 standard amino acids gives the same degradation product.
C) All final degradation products are citric acid cycle intermediates.
D) Some, but not all, final degradation products are citric acid cycle intermediates.